Production and stability of dislocation loops in an MgO-Al2O3 system under concurrent irradiation with ions and electrons

Kazuhiro Yasuda, Chiken Kinoshita, Masaki Ohmura, Hiroaki Abe

Research output: Contribution to journalConference article

14 Citations (Scopus)

Abstract

In situ microstructure observations have been carried out for crystals of an MgO-Al2O3 system under concurrent irradiation with ions and electrons in a TEM-accelerator facility to gain insights into their concurrent irradiation effects. MgO·Al2O3, MgO·2.4Al2O3 and α-Al2O3 were irradiated concurrently with 300 keV O+ and 200 keV electrons or solely with 300 keV O+ at 870 K. Retardation of dislocation loop nucleation was observed in MgO·Al2O3, and MgO·2.4Al2O3 crystals under the concurrent irradiation, though no significant changes were observed in the microstructure of α-Al2O3 between regions irradiated concurrently with ions and electrons, and irradiated solely with ions. Further, the concurrent irradiation has been found to enhance the growth of dislocation loops in MgO·Al2O3 and MgO·2.4Al2O3 at the periphery of a focused electron beam. The different response in the concurrent irradiation effects among the crystals of MgO-Al2O3 system are discussed in terms of the nucleation rate of dislocation loops under 300 keV O+ irradiation and the stability of loops under electron irradiation, which depend on electron energy and irradiation temperature.

Original languageEnglish
Pages (from-to)107-114
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume166
DOIs
Publication statusPublished - May 2 2000
Event10th International Conference on Radiation Effects in Insulators - Jena, Ger
Duration: Jul 18 1999Jul 23 1999

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Irradiation
irradiation
Electrons
Ions
ions
electrons
electron irradiation
Crystals
nucleation
Nucleation
crystals
microstructure
Microstructure
Electron irradiation
accelerators
Particle accelerators
Electron beams
electron beams
electron energy
transmission electron microscopy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

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title = "Production and stability of dislocation loops in an MgO-Al2O3 system under concurrent irradiation with ions and electrons",
abstract = "In situ microstructure observations have been carried out for crystals of an MgO-Al2O3 system under concurrent irradiation with ions and electrons in a TEM-accelerator facility to gain insights into their concurrent irradiation effects. MgO·Al2O3, MgO·2.4Al2O3 and α-Al2O3 were irradiated concurrently with 300 keV O+ and 200 keV electrons or solely with 300 keV O+ at 870 K. Retardation of dislocation loop nucleation was observed in MgO·Al2O3, and MgO·2.4Al2O3 crystals under the concurrent irradiation, though no significant changes were observed in the microstructure of α-Al2O3 between regions irradiated concurrently with ions and electrons, and irradiated solely with ions. Further, the concurrent irradiation has been found to enhance the growth of dislocation loops in MgO·Al2O3 and MgO·2.4Al2O3 at the periphery of a focused electron beam. The different response in the concurrent irradiation effects among the crystals of MgO-Al2O3 system are discussed in terms of the nucleation rate of dislocation loops under 300 keV O+ irradiation and the stability of loops under electron irradiation, which depend on electron energy and irradiation temperature.",
author = "Kazuhiro Yasuda and Chiken Kinoshita and Masaki Ohmura and Hiroaki Abe",
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T1 - Production and stability of dislocation loops in an MgO-Al2O3 system under concurrent irradiation with ions and electrons

AU - Yasuda, Kazuhiro

AU - Kinoshita, Chiken

AU - Ohmura, Masaki

AU - Abe, Hiroaki

PY - 2000/5/2

Y1 - 2000/5/2

N2 - In situ microstructure observations have been carried out for crystals of an MgO-Al2O3 system under concurrent irradiation with ions and electrons in a TEM-accelerator facility to gain insights into their concurrent irradiation effects. MgO·Al2O3, MgO·2.4Al2O3 and α-Al2O3 were irradiated concurrently with 300 keV O+ and 200 keV electrons or solely with 300 keV O+ at 870 K. Retardation of dislocation loop nucleation was observed in MgO·Al2O3, and MgO·2.4Al2O3 crystals under the concurrent irradiation, though no significant changes were observed in the microstructure of α-Al2O3 between regions irradiated concurrently with ions and electrons, and irradiated solely with ions. Further, the concurrent irradiation has been found to enhance the growth of dislocation loops in MgO·Al2O3 and MgO·2.4Al2O3 at the periphery of a focused electron beam. The different response in the concurrent irradiation effects among the crystals of MgO-Al2O3 system are discussed in terms of the nucleation rate of dislocation loops under 300 keV O+ irradiation and the stability of loops under electron irradiation, which depend on electron energy and irradiation temperature.

AB - In situ microstructure observations have been carried out for crystals of an MgO-Al2O3 system under concurrent irradiation with ions and electrons in a TEM-accelerator facility to gain insights into their concurrent irradiation effects. MgO·Al2O3, MgO·2.4Al2O3 and α-Al2O3 were irradiated concurrently with 300 keV O+ and 200 keV electrons or solely with 300 keV O+ at 870 K. Retardation of dislocation loop nucleation was observed in MgO·Al2O3, and MgO·2.4Al2O3 crystals under the concurrent irradiation, though no significant changes were observed in the microstructure of α-Al2O3 between regions irradiated concurrently with ions and electrons, and irradiated solely with ions. Further, the concurrent irradiation has been found to enhance the growth of dislocation loops in MgO·Al2O3 and MgO·2.4Al2O3 at the periphery of a focused electron beam. The different response in the concurrent irradiation effects among the crystals of MgO-Al2O3 system are discussed in terms of the nucleation rate of dislocation loops under 300 keV O+ irradiation and the stability of loops under electron irradiation, which depend on electron energy and irradiation temperature.

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